An eccentric sheave pivoted at a point rotates and imparts oscillating motion to a linked arm; what mechanism type is this___________________?
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Answer: C. 4 links
Explanation
An eccentric sheave, connecting rod, frame, and follower together form a four-bar linkage. Each individual component acts as a distinct rigid link connected by turning or sliding joints. Counting the sheave, rod, frame, and follower yields a total of four interacting links. A kinematic link is any rigid body that transmits motion to another component within a mechanism. An eccentric sheave functions equivalently to a circular crank with an offset pivot axis. Four-bar linkages are the foundational building blocks for complex mechanical motion conversion systems.
Reciprocating pumps and mechanical shakers use eccentric sheave mechanisms to generate periodic motion. Engineers analyze link counts to determine degrees of freedom using Grubler's mobility criterion. Understanding linkage kinematics is essential for designing reliable automated machinery in industrial plants. Option A describes an insufficient number of elements to form a complete closed kinematic chain. Option B describes a three-link assembly, which lacks the mobility required to function as a mechanism. Option D suggests five links, which overcomplicates the simple eccentric sheave and follower assembly.
- Subject
- Engineering
- Category
- Mechanical Engineering
- Topic
- —
- Difficulty
- medium
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